Found this via Ask Jeeves:

flaperon

SYLLABICATION: flap·er·on
PRONUNCIATION: flp-rn
NOUN: A control surface on an aircraft wing functioning both as a flap and as an aileron.
ETYMOLOGY: flap + (ail)eron.

The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved.


This one is interesting, showing a full scale implementation but no mention of elevators... [link=http://www.tpub.com/air/9-7.htm]Flaperons[/link]